News Release 

Marriage may not aid financial savings for those who favor immediate rewards

Study from Vietnam highlights importance of savings strategies that function outside of households


A study of married couples in Vietnam suggests that, when one spouse tends to favor immediate rewards, marriage does not help them commit to saving money. Hisaki Kono of Kyoto University, Japan, and Tomomi Tanaka of the World Bank, US, present these findings in the open-access journal PLOS ONE.

The tendency to overvalue immediate rewards, known as present bias, is a major obstacle to building financial savings. Formal and informal structures like retirement plans or rotating savings and credit associations (ROSCAs) can help people with present bias build savings. Another possible solution is for a present-biased person to delegate spending decisions to their non-present-biased spouse, but no previous research has evaluated this strategy's success.

To investigate whether marriage can serve as a savings commitment device for present-biased people, Kono and Tanaka studied 134 married couples in a relatively wealthy community in Vietnam. They surveyed husbands and wives separately and together to understand their financial habits. The couples also participated in experiments in which they made imaginary financial decisions both separately and together.

The results suggest that marriage does not aid savings for couples with a present-biased spouse. While joint decisions made between spouses were less present-biased than individual decisions, present-biased spouses gave a smaller proportion of their income to their spouses, received more money from their spouses' earnings, and were more likely to be in charge of household resources. Even when present-biased spouses received smaller allowances, they tended to conceal money, hampering efforts to save.

While it's not clear how much these results generalize outside of Vietnam, the study highlights the value of savings strategies outside of a married couple's household, including retirement plans and ROSCAs, which could protect money from a present-biased spouse. Future research could help identify the underlying factors within a marriage that cause a present-biased spouse to receive more resources.

Kono adds: "Present-biased individuals turn over a smaller ratio of their earnings to their spouses, and receive larger amounts of money from their spouses' incomes. Marriage exacerbates the problem of present bias, and external savings commitment devices are required to protect money from their present-biased spouses."


Citation: Kono H, Tanaka T (2019) Does marriage work as a savings commitment device? Experimental evidence from Vietnam. PLoS ONE 14(6): e0217646.

Funding: H.K. received a grant from the Japan Society for the Promotion of Science (KAKENHI 20730198), and T.T. received an internal fund from the Arizona State University The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing Interests: The authors have declared that no competing interests exist.

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